Lens driving device, camera module, and camera-equipped device

ABSTRACT

A lens driving device is provided with: a driving part including a movable part and a fixing part, a base member having a rectangular shape in plan view, wherein a shield cover is attached at a peripheral portion of the base member, and a side surface of the peripheral portion and a lower inner peripheral surface of the shield cover are bonded to each other, and a ground terminal part disposed in the base member. The base member includes at a first side of the peripheral portion a plurality of terminal housing parts recessed from the side surface. The ground terminal part includes a first ground terminal part integrally attached to the first side, and the first ground terminal part includes a plurality of ground terminals having different lengths, the ground terminals being respectively disposed in the plurality of terminal housing parts to be separated from the side surface.

TECHNICAL FIELD

The present invention relates to a lens driving device for auto focus orshake correction, a camera module having an auto-focusing function or ashake-correcting function, and a camera mounting device.

BACKGROUND ART

In general, a small-sized camera module is mounted in a mobile terminalsuch as a smartphone. In such a camera module, a lens driving device(for example, PTL 1) is employed. The lens driving device has anauto-focusing function of automatically performing focusing forcapturing a subject (hereinafter referred to as “AF (Auto Focus)function”), and a shake-correcting function (hereinafter referred to as“OIS (Optical Image Stabilization) function”) of correcting shake(vibration) upon capturing an image to reduce the irregularities of theimage.

The auto-focusing and shake-correcting lens driving device includes anauto-focusing driving part (hereinafter referred to as “AF drivingpart”) for moving the lens part in the light axis direction, and ashake-correcting driving part (hereinafter referred to as “OIS drivingpart”) for swaying the lens part in a plane orthogonal to the light axisdirection.

The AF driving part includes, for example, an auto-focusing coil part(hereinafter referred to as “AF coil part”) disposed around the lenspart, and an auto-focusing magnet part (hereinafter referred to as “AFmagnet part”) disposed separately from the AF coil part in the radialdirection. Automatic focusing is performed by moving an AF movable partincluding the lens part and the AF coil part with respect to an AFfixing part including the AF magnet part in the light axis directionwith use of a driving force of a voice coil motor composed of the AFcoil part and the AF magnet part, for example.

Here, a lens position for bringing a subject at a smallest capturedistance (a position on the most light reception side) into focus iscalled “macro position,” and a lens position for bringing a subject atthe infinity (a position on the most imaging side) into focus is called“infinity position.” That is, the range from the macro position to theinfinity position is the movable range of the AF movable part.

The OIS driving part includes a shake-correcting magnet part(hereinafter referred to as “OIS magnet part”) disposed at the AFdriving part, and a shake-correcting coil part (hereinafter referred toas “OIS coil part”) disposed separately from the OIS magnet part in thelight axis direction, for example. A shake correction movable part(hereinafter referred to as “OIS movable part”) including the AF drivingpart and the OIS magnet part is supported by a supporting member so asto be separated from a shake-correcting fixing part (hereinafterreferred to as “OIS fixing part”) including the OIS coil part in thelight axis direction. The OIS movable part is swayed in a planeorthogonal to the light axis direction by use of a driving force of avoice coil motor composed of the OIS magnet part and the OIS coil part,and thus shake correction is performed (so-called barrel shift system).The OIS magnet part can also serve as the AF magnet part, and with sucha configuration, the size and the height of the lens driving device canbe reduced.

The lens part is attached to the lens driving device including the AFdriving part or the OIS driving part, and these parts are housed in acover, thereby assembling a camera module. In addition, preferably, thecover is composed of a conductive material, and grounded in view ofpreventing generation of noise (so-called shield cover). For example, inthe case where a lower inner peripheral surface of the cover is broughtinto contact with and bonded to a side surface of a peripheral portionof the base member serving as a part of the OIS fixing part, the coverand the ground terminal can be electrically connected with each other bydisposing the ground terminal along the side surface of the peripheralportion of the base member.

CITATION LIST Patent Literature PTL 1 Japanese Patent ApplicationLaid-Open No. 2013-210550 SUMMARY OF INVENTION Technical Problem

In the case where the cover is grounded with the above-describedstructure, the base member and the cover are attached to each other, andthereafter an adhesive agent is supplied to the contact surface betweenthe base member and the cover. In the case where the attachment positionof the ground terminal is shifted with an attaching tolerance, theadhesive agent advances to the contact surface between the cover and theground terminal in some situation. In this case, the cover and theground terminal are partially insulated, and consequently conductionfailure may possibly occur with impact of dropping or the like.

An object of the present invention is to provide a lens driving devicehaving high reliability which can ensure the conduction state betweenthe shield cover and the ground terminal even in the case where theattachment position of the ground terminal is shifted with an attachingtolerance, and a camera module and a camera mounting device includingthe lens driving device.

Solution to Problem

A lens driving device according to an embodiment of the presentinvention includes: a driving part including a movable part where a lenspart is disposed and a fixing part where the movable part is fixed; abase member having a rectangular shape in plan view, wherein a shieldcover is attached at a peripheral portion of the base member, and a sidesurface of the peripheral portion and a lower inner peripheral surfaceof the shield cover are bonded to each other with an adhesive agent; anda ground terminal part disposed in the base member and configured to beelectrically connected with the shield cover, wherein: the base memberincludes at a first side of the peripheral portion a plurality ofterminal housing parts recessed from the side surface, the groundterminal part includes a first ground terminal part integrally attachedto the first side, and the first ground terminal part includes aplurality of ground terminals having different lengths, the groundterminals being respectively disposed in the plurality of terminalhousing parts so as to be separated from the side surface.

A camera module according to an embodiment of the present inventionincludes: the above-mentioned lens driving device; a lens part mountedto the movable part; an image capturing part configured to capture asubject image imaged with the lens part; and a shield cover attached tothe base member.

A camera mounting device according to an embodiment of the presentinvention is an information apparatus or a transport apparatus, theabove-mentioned camera mounting device including the camera module.

Advantageous Effects of Invention

According to the present invention, a first ground terminal partintegrally attached to a first side of the peripheral portion of thebase member has a plurality of ground terminals having differentlengths, and thus, even when the attachment position of one of theground terminals is changed to a position where the conduction statewith the shield cover is easily impaired with an attaching tolerance,the attachment position of the other ground terminal is held at aposition where the conduction state with the shield cover can beensured. Accordingly, even in the case where the attachment position ofthe ground terminal is shifted with an attaching tolerance, theconduction state between the shield cover and the ground terminal isensured, and the reliability of lens driving device is remarkablyimproved.

BRIEF DESCRIPTION OF DRAWINGS

FIGS. 1A and 1B illustrate a smartphone in which a camera moduleaccording to an embodiment of the present invention is mounted;

FIG. 2 is a perspective view of an external appearance of the cameramodule;

FIG. 3 is an exploded perspective view of the camera module;

FIG. 4 is an exploded perspective view of a lens driving device;

FIG. 5 is an exploded perspective view of an OIS movable part;

FIG. 6 is an exploded perspective view of an OIS fixing part;

FIGS. 7A and 7B are enlarged views illustrating a wire insertion part ina magnet holder;

FIG. 8 is an enlarged view illustrating an attaching state of a groundterminal to a base member; and

FIGS. 9A and 9B illustrate an automobile serving as a camera mountingdevice in which an in-vehicle camera module is mounted.

DESCRIPTION OF EMBODIMENT

In the following, an embodiment of the present invention is described indetail with reference to the drawings. FIGS. 1A and 1B illustratesmartphone M in which camera module A according to the embodiment of thepresent invention is mounted. FIG. 1A is a front view of smartphone M,and FIG. 1B is a rear view of smartphone M.

For example, smartphone M is provided with camera module A as a backside camera OC. Camera module A has an auto-focusing function and ashake-correcting function, and can capture an image without imageblurring by automatically performing focusing at the time of capturing asubject and by correcting shake (vibration) at the time of capturing animage.

FIG. 2 is a perspective view of an external appearance of camera moduleA. FIG. 3 is an exploded perspective view of camera module A. Asillustrated in FIG. 2 and FIG. 3, descriptions will be made with anorthogonal coordinate system (X, Y, Z) in the present embodiment. Alsoin the drawings described later, descriptions will be made with anorthogonal coordinate system (X, Y, Z). Camera module A is mounted suchthat the vertical direction (or horizontal direction) is the Xdirection, the horizontal direction (or vertical direction) is the Ydirection, and the front-rear direction is the Z direction at the timeof actually capturing an image with smartphone M. That is, the Zdirection is the light axis direction, the upper side in the drawing isthe light reception side in the light axis direction (also referred toas “macro position side”), and the lower side is the imaging side in thelight axis direction (also referred to as “infinity position side”).

Camera module A includes a lens part (not illustrated) in which a lensis housed in a lens barrel having a cylindrical shape, AF and OIS lensdriving device 1, an image capturing part (not illustrated) thatcaptures a subject image imaged with the lens part, shield cover 2 thatcovers the entirety, and the like.

As viewed in the light axis direction, shield cover 2 is a capped squarecylindrical body having a square shape in plan view. Circular opening 2a is formed in the top surface of shield cover 2. A lens part (notillustrated) is exposed to the outside through opening 2 a. Shield cover2 is fixed to base member 23 (see FIG. 6) of OIS fixing part 20 of lensdriving device 1. Shield cover 2 has conductivity. Shield cover 2 iselectrically connected with ground terminal parts 221 and 222 of OISfixing part 20, and is grounded.

The image capturing part (not illustrated) includes an imaging device(not illustrated), and is disposed on the imaging side in the light axisdirection of the lens driving device 1. The imaging device (notillustrated) is composed of, for example, a CCD (charge coupled device)image sensor, a CMOS (complementary metal oxide semiconductor) imagesensor, or and the like. The imaging device (not illustrated) captures asubject image imaged by a lens part (not illustrated).

FIG. 4 is an exploded perspective view of lens driving device 1. Asillustrated in FIG. 4, lens driving device 1 includes OIS movable part10, OIS fixing part 20, supporting member 30 and the like.

OIS movable part 10 includes an OIS magnet part serving as a componentof the OIS voice coil motor, and sways in the XY plane at the time ofshake correction. OIS fixing part 20 includes an OIS coil part. OISmovable part 10 includes an AF driving part.

OIS movable part 10 is disposed on the light reception side in the lightaxis direction relative to OIS fixing part 20 and is separated from OISfixing part 20. OIS movable part 10 is coupled with OIS fixing part 20by supporting member 30. To be more specific, supporting member 30 iscomposed of four suspension wires extending along the Z direction(hereinafter referred to as “suspension wire 30”). One end (upper end)of suspension wire 30 is fixed to OIS movable part 10 (upper elasticsupporting part 13, see FIG. 5), and the other end (lower end) ofsuspension wire 30 is fixed to OIS fixing part 20 (coil substrate 21,see FIG. 6). OIS movable part 10 is supported by suspension wire 30 suchthat OIS movable part 10 can sway in the XY plane. Two of the foursuspension wires 30 are used for feeding power to AF coil part 112 (seeFIG. 5). It is to be noted that the number of suspension wires 30 is notlimited, and five or more suspension wires 30 may be provided.

FIG. 5 is an exploded perspective view of OIS movable part 10. Asillustrated in FIG. 5, OIS movable part 10 includes AF movable part 11,AF fixing part 12, upper elastic supporting part 13, lower elasticsupporting part 14 and the like. AF movable part 11 includes an AF coilpart serving as a component of an AF voice coil motor, and moves in thelight axis direction at the time of focusing. AF fixing part 12 is apart having an AF magnet part. That is, the AF driving part of lensdriving device 1 is of a moving coil type. AF movable part 11 isdisposed on the radially inside relative to AF fixing part 12 and isseparated from AF fixing part 12. AF movable part 11 is coupled with AFfixing part 12 by upper elastic supporting part 13 and lower elasticsupporting part 14.

AF movable part 11 includes lens holder 111 and AF coil part 112.

Lens holder 111 is a member having a quadrangular cylindrical shape, anda lens part (not illustrated) is fixed to lens housing part 111 a havinga cylindrical shape by bonding or screwing. Lens holder 111 includesupper flange part 111 b and lower flange part 111 c on the peripheralsurface of lens housing part 111 a. AF coil part 112 is wound at a part(hereinafter referred to as “coil winding part”) sandwiched betweenupper flange part 111 b and lower flange part 111 c.

Lens holder 111 includes, at positions corresponding to the four cornersat an upper portion of the outer periphery of lens housing parts 111 a,upper spring fixing part 111 d for fixing upper elastic supporting part13. Lens holder 111 includes tying parts 111 e that protrude outward ina radial direction from two diagonally-opposite upper spring fixingparts 111 d of four upper spring fixing parts 111 d.

Top surface 111 f of upper flange part 111 b serves as a locking partfor restricting movement of AF movable part 11 to the light receptionside in the light axis direction (hereinafter referred to as “firstlocking part 111 f”). Lower elastic supporting part 14 is fixed tobottom surface 111 g of lower flange part 111 c (hereinafter referred toas “lower spring fixing part 111 g”).

Lens holder 111 includes protruding parts 111 h that protrude outward ina radial direction over upper flange part 111 b and lower flange part111 c at opposite positions in the X direction and the Y direction of anupper portion of the outer periphery of lens housing part 111 a.Protruding part 111 h serves as a locking part for restricting movementof AF movable part 11 to the imaging side in the light axis direction(hereinafter referred to as “second locking part 111 h”).

AF coil part 112 is an air-core coil that is energized at the time offocusing, and is wound around the outer peripheral surface of a coilwinding part of lens holder 111. The both ends of AF coil part 112 aretied to tying parts 111 e of lens holder 111.

AF fixing part 12 includes magnet holder 121 and magnet part 122. WhileFIG. 5 illustrates a state where magnet holder 121 is attached on magnetpart 122, magnet part 122 is attached after AF movable part 11 isinserted to magnet holder 121 in practice.

Magnet holder 121 has a quadrangular cylindrical shape which is squarein plan view. Four connection parts (four sides extending along theZ-axis direction) connecting the side walls of magnet holder 121 arerecessed to radially inside in an arc-like shape. Suspension wire 30 isdisposed at this portion (hereinafter referred to as “wire insertionpart 121 a”). With wire insertion part 121 a, interference betweensuspension wire 30 and magnet holder 121 at the time when OIS movablepart 10 sways is avoided.

As illustrated in FIGS. 7A and 7B in an enlarged manner, the internaldiameter of wire insertion part 121 a is larger on the lower side thanthe upper side. Here, wire insertion part 121 a has a truncated coneshape whose internal diameter gradually decreases from the imaging sidetoward the light reception side in the light axis direction.

The lower portion of suspension wire 30 is fixed to coil substrate 21,and does not follow the sway of magnet holder 121, and accordingly, thedistance to magnet holder 121 thereof changes. In view of this, in wireinsertion part 121 a, a portion corresponding to the lower portion ofsuspension wire 30 is largely cut out so that magnet holder 121 andsuspension wire 30 do not interfere with each other at the time when OISmovable part 10 sways.

In contrast, the upper portion of suspension wire 30 follows the sway ofmagnet holder 121, and therefore the distance to magnet holder 121thereof is maintained. Accordingly, the size of the portion of wireinsertion part 121 a which corresponds to the upper portion ofsuspension wire 30 can be small. By setting the internal diameter ofwire insertion part 121 a such that the internal diameter of the upperportion is smaller than that of the lower portion, the mechanicalstrength of magnet holder 121 can be increased. Accordingly, the size ofthe external shape of magnet holder 121 can be set to a small value, andin turn, downsizing of lens driving device 1 can be achieved.

Magnet holder 121 includes, at the upper portion, stopper parts 121 bthat protrude inward in the radial direction in a ring-shape. In stopperpart 121 b, the portion corresponding to second locking part 111 h andupper spring fixing part 111 d of lens holder 111 is cut out such thatAF movable part 11 can move to the light reception side in the lightaxis direction relative to the top surface of magnet holder 121. When AFmovable part 11 moves to the light reception side in the light axisdirection, stopper part 121 b makes contact with first locking part 111f of lens holder 111, and thus the movement of AF movable part 11 to thelight reception side in the light axis direction is restricted. Inaddition, arm parts 131 c and 132 c of upper elastic supporting part 13are placed on the top surface of stopper part 121 b. The top surface ofmagnet part 122 makes contact with the bottom surface of stopper part121 b.

Lower elastic supporting part 14 is fixed to bottom surface 121 e ofmagnet holder 121 (hereinafter referred to as “lower spring fixing part121 e”). Magnet holder 121 includes, at the four corners of the upperportion, upper spring fixing parts 121 c that fix upper elasticsupporting part 13. The peripheral portion of the upper boss having atrapezoidal columnar shape disposed in upper spring fixing part 121 c isslightly recessed from the top surface (the surface on which upperelastic supporting part 13 is attached) of magnet holder 121 such that agap (damper installation part 121 d) is formed when upper elasticsupporting part 13 is attached. The corner (the portion providedcontinuously with the upper portion of wire insertion part 121 a) ofdamper installation part 121 d protrudes to the outside relative to thelower portion, and is cut out in an arc-like shape. The cut-out portionhaving an arc-like shape of damper installation part 121 d forms a partof wire insertion part 121 a.

Magnet part 122 includes four permanent magnets each having a cuboidshape. Magnet part 122 is disposed along the internal surface of each ofthe four side walls of magnet holder 121. Magnet parts 122 aremagnetized such that a traversing magnetic field in the radial directionis formed at AF coil part 112. For example, magnet parts 122 aremagnetized such that the inner periphery side and the outer peripheryside thereof are set to N pole and S pole, respectively.

The AF voice coil motor is composed of magnet part 122 and AF coil part112. In the present embodiment, magnet part 122 serves as the AF magnetpart and as the OIS magnet part.

Upper elastic supporting part 13 is a leaf spring formed of berylliumcopper, nickel copper, stainless-steel or the like, for example, and hasa square shape as a whole in plan view. Upper elastic supporting part 13elastically connects AF fixing part 12 (magnet holder 121) and AFmovable part 11 (lens holder 111).

Upper elastic supporting part 13 is composed of two upper leaf springs13A and 13B (upper elastic supporting members) which are disposed in apoint-symmetrical manner about the light axis. Each of upper leafsprings 13A and 13B includes spring parts 131 and 132. Since theconfigurations of upper spring parts 13A and 13B are similar to eachother, the description of upper leaf spring 13B is omitted.

In upper leaf spring 13A, spring part 131 includes lens holder fixingpart 131 a that is fixed to lens holder 111, magnet holder fixing part131 b that is disposed at a position at 90 degrees from lens holderfixing part 131 a and is fixed to magnet holder 121, and arm part 131 cthat couples lens holder fixing part 131 a and magnet holder fixing part131 b. In addition, lens holder fixing part 131 a includes coilconnecting part 131 d that has a U-shape in plan view and is bonded bysoldering to an end portion of AF coil part 112.

Likewise, spring part 132 includes lens holder fixing part 132 a that isfixed to lens holder 111, magnet holder fixing part 132 b that isdisposed at a position at 90 degrees from lens holder fixing part 132 aand is fixed to magnet holder 121, and arm part 132 c that couples lensholder fixing part 132 a and magnet holder fixing part 132 b.

Lens holder fixing parts 131 a and 132 a are coupled by inner couplingpart 133 at a position inside arm part 131 c. In addition, magnet holderfixing parts 131 b and 132 b are coupled by outer coupling part 134 at aposition outside arm part 132 c.

Each of lens holder fixing parts 131 a and 132 a has a shapecorresponding to upper spring fixing part 111 d of lens holder 111. Whenthe positioning bosses of lens holder 111 are fitted into the fixingholes of lens holder fixing parts 131 a and 132 a, upper leaf springs13A and 13B are positioned and fixed to lens holder 111. Coil connectingpart 131 d is electrically connected by soldering with AF coil part 112tied to tying part 111 e of lens holder 111.

Each of magnet holder fixing parts 131 b and 132 b has a shapecorresponding to upper spring fixing part 121 c of magnet holder 121.When the positioning bosses of upper spring fixing parts 121 c arefitted into the fixing holes of magnet holder fixing parts 131 b and 132b, upper leaf springs 13A and 13B are positioned and fixed to magnetholder 121. In addition, each of vertex parts 131 e and 132 e of magnetholder fixing parts 131 b and 132 b serves as a wire connecting part(hereinafter referred to as “wire connecting parts 131 e and 132 e”)where suspension wire 30 is connected.

Wire connecting parts 131 e and 132 e are located on the light receptionside of wire insertion part 121 a of magnet holder 121 in the light axisdirection. In the state where upper leaf springs 13A and 13B areattached to magnet holder 121, a gap is formed between damperinstallation part 121 d and wire connecting parts 131 e and 132 e. Adamper is disposed in this gap. In addition, each of wire connectingparts 131 e and 132 e has a shape which is easily elastically deformed.With deflection of wire connecting parts 131 e and 132 e and suspensionwire 30, drop impact is absorbed. Thus, plastic deformation and ruptureof suspension wire 30 with drop impact can be effectively prevented.

Arm parts 131 c and 132 c couple lens holder fixing part 131 a andmagnet holder fixing part 131 b, and lens holder fixing part 132 a andmagnet holder fixing part 132 b, respectively. Each of arm parts 131 cand 132 c is formed in an arc-like shape, and is elastically deformedwhen AF movable part 11 moves.

As with upper elastic supporting part 13, lower elastic supporting part14 is a leaf spring (hereinafter referred to as “lower leaf spring 14”)made of beryllium copper, nickel copper, stainless-steel or the like.Lower elastic supporting part 14 elastically connects AF fixing part 12(magnet holder 121) and AF movable part 11 (lens holder 111).

Lower leaf spring 14 (lower elastic supporting member) includes fourspring parts 141 to 144. Spring part 141 includes lens holder fixingpart 141 a that is fixed to lens holder 111, magnet holder fixing part141 b that is disposed at a position at 90 degrees from lens holderfixing part 141 a and is fixed to magnet holder 121, and arm part 141 cthat couples lens holder fixing part 141 a and magnet holder fixing part141 b. The configurations of spring parts 142 to 144 are similar to theabove-mentioned configuration.

In lens holder fixing parts 141 a to 144 a, the lens holder fixing partsadjacent to each other are coupled with coupling part 145 to have ashape corresponding to lower spring fixing part 111 g of lens holder111. When the positioning bosses of lens holder 111 are fitted into thefixing holes of lens holder fixing parts 141 a to 144 a, lower leafspring 14 is positioned and fixed to lens holder 111.

Magnet holder fixing parts 141 b to 144 b have shapes corresponding tolower spring fixing part 121 e of magnet holder 121. When thepositioning bosses of upper spring fixing parts 121 c are fitted intothe fixing holes of magnet holder fixing parts 131 b and 132 b, upperleaf springs 13A and 13B are positioned and fixed to magnet holder 121.

At the time of assembling OIS movable part 10 (AF driving part), first,magnet holder fixing parts 131 b and 132 b of upper leaf springs 13A and13B are attached to upper spring fixing part 121 c of magnet holder 121.In addition, lens holder fixing parts 141 a to 144 a of lower leafspring 14 are attached to lower spring fixing part 111 g of lens holder111.

Next, lens holder 111 is fitted into magnet holder 121 from the imagingside in the light axis direction. At this time, second locking part 111h and upper spring fixing part 111 d of lens holder 111 are fitted tothe cutout of stopper part 121 b of magnet holder 121. Then, lens holderfixing parts 131 a and 132 a of upper leaf springs 13A and 13B areattached to upper spring fixing parts 111 d of lens holder 111. Coilconnecting part 131 d is bonded by soldering to the both ends of AF coilpart 112 tied to tying part 111 e of lens holder 111, so as to beelectrically connected. In addition, magnet holder fixing parts 141 b to144 b of lower leaf spring 14 are attached to lower spring fixing part121 e of magnet holder 121.

Next, magnet part 122 is inserted from the imaging side in the lightaxis direction, and bonded to magnet holder 121. In this manner, OISmovable part 10 (AF driving part) is assembled.

FIG. 6 is an exploded perspective view of OIS fixing part 20. Asillustrated in FIG. 6, OIS fixing part 20 includes coil substrate 21,sensor substrate 22, base member 23, position detection part 24 and thelike.

In plan view, coil substrate 21 has a square shape, and has circularopening 21 a at a center portion. Coil substrate 21 includes, at thefour corners, wire fixing holes 21 b through which the other end (lowerend) of suspension wire 30 is inserted. In addition, coil substrate 21includes, at positions which intersect the diagonal direction ofperipheral portions of opening 21 a, positioning holes 21 c.

Coil substrate 21 includes OIS coil part 211 at a position opposite tomagnet part 122 in the light axis direction. OIS coil part 211 includesfour OIS coils 211A to 211D corresponding to magnet parts 122. The sizesand positions of OIS coil part 211 and magnet part 122 and magnet parts122 are set such that the magnetic field radiated from the bottomsurfaces of magnet parts 122 traverses the long side portions of OIScoils 211A to 211D in the Z direction. The OIS voice coil motor iscomposed of magnet part 122 and OIS coil part 211.

As with coil substrate 21, sensor substrate 22 has a square shape inplan view, and has circular opening 22 a at a center portion. Sensorsubstrate 22 includes, at peripheral portions of opening 22 a,positioning holes 22 b at positions corresponding to positioning holes21 c of coil substrate 21. Sensor substrate 22 includes, at two sidesalong the Y direction, control terminal parts 223 and 224 that are bentdownward. Sensor substrate 22 includes, at the two sides along the Xdirection (the two sides opposite to each other in the Y direction),ground terminal parts 221 and 222. Ground terminal parts 221 and 222 areelectrically connected with shield cover 2.

Ground terminal part 221 is composed of ground terminals 221A and 221Bhaving different lengths that are protruded outward and bent downward(hereinafter referred to as “first ground terminal 221A” and “secondground terminal 221B”). Likewise, ground terminal part 222 is composedof ground terminals 222A and 222B having different lengths that areprotruded outward and bent downward (hereinafter referred to as “thirdground terminal 222A” and “fourth ground terminal 222B”). That is, thelengths of the ground terminals in one side are different from eachother.

Here, first ground terminal 221A and third ground terminal 222A have thelonger length, and second ground terminal 221B and fourth groundterminal 222B have the shorter length. That is, the lengths of theground terminals opposite to each other in the Y direction are equal toeach other. It is to be noted that the lengths of the ground terminalsopposite to each other in the Y direction may be different from eachother.

The length of first ground terminal 221A is set such that the contactarea with shield cover 2 is sufficiently ensured even when protrudinglength L1 of first ground terminal 221A to first ground terminal housingpart 231A (see FIG. 8) is small due to the attaching tolerance of sensorsubstrate 22 attached to base member 23. In addition, the length is setsuch that first ground terminal 221A is housed in first ground terminalhousing part 231A (or that first ground terminal 221A is not placed ontoside surface 23 d of base member 23) even when the protruding length offirst ground terminal 221A to first ground terminal housing part 231A islarge. The same applies to third ground terminal 222A.

The length of second ground terminal 221B is set such that the distancefrom the edge of base member 23 (that is, side surface 23 d) issufficiently ensured even when protruding length L2 of second groundterminal 221B to second ground terminal housing part 231B (see FIG. 8)is large due to the attaching tolerance of sensor substrate 22 attachedto base member 23. In addition, the length is set such that secondground terminal 221B is exposed to second ground terminal housing part231B even when the protruding length of second ground terminal 221B tosecond ground terminal housing part 231B is small. The same applies tofourth ground terminal 222B.

Sensor substrate 22 AF includes a power-source line (not illustrated)for power feeding to coil part 112 and OIS coil part 211, and a signalline (not illustrated) for a detection signal output from Hall devices24A and 24B. Position detection part 24 that detects the position of OISmovable part 10 in the XY plane is disposed on the bottom surface ofsensor substrate 22.

Position detection part 24 is composed of Hall devices 24A and 24B(magnetic sensors) that detect the magnetic field by utilizing Halleffect, for example. Hall devices 24A and 24B are respectively disposedat adjacent two sides of the bottom surface of sensor substrate 22, atan approximate center thereof. By detecting the magnetic field formed bymagnet part 122 with Hall devices 24A and 24B, the position of OISmovable part 10 in the XY plane can be specified. It is to be noted thata magnet for position detection may be disposed independently of magnetpart 122 in OIS movable part 10.

As with coil substrate 21, base member 23 has a square shape in planview, and has circular opening 23 a at a center portion. Base member 23includes, at peripheral portions of opening 23 a, positioning bosses 23b at positions corresponding to positioning holes 21 c of coil substrate21 and positioning holes 22 b of sensor substrate 22. In addition, basemember 23 includes, at peripheral portions of opening 23 a, Hall devicehousing parts 23 e at positions corresponding to Hall devices 24A and24B.

Base member 23 includes, at positions corresponding to control terminalparts 223 and 224 of sensor substrate 22 at the two sides of theperipheral portion along the Y direction, control terminal housing parts233 and 234 which are further recessed from side surface 23 d. Inaddition, base member 23 includes, at positions corresponding to groundterminals 221 and 222 of sensor substrate 22 at the two sides of theperipheral portion along the X direction, ground terminal housing parts231 and 232 further recessed from side surface 23 d.

Ground terminal housing part 231 includes first ground terminal housingpart 231A where first ground terminal 221A is disposed, and secondground terminal housing part 231B where second ground terminal 221B isdisposed. Likewise, ground terminal housing part 232 includes thirdground terminal housing part 232A where third ground terminal 222A isdisposed, and fourth ground terminal housing part 232B where fourthground terminal 222B is disposed.

Along protruding part 23 c, first ground terminal 221A to fourth groundterminal 222B are disposed to first ground terminal housing part 231A tofourth ground terminal housing part 232B, respectively. First groundterminal 221A to fourth ground terminal 222B are separated from thereference surfaces of first ground terminal housing part 231A to fourthground terminal housing part 232B. With this configuration, first groundterminal 221A to fourth ground terminal 222B are flush with side surface23 d of base member 23.

Base member 23 includes, in the region except for the regions of groundterminal housing parts 231 and 232 in the two sides where groundterminal housing parts 231 and 232 are provided, cover placing part 23 ffor placing shield cover 2. Cover placing part 23 f is formed byrecessing a part of the cover placing surface such that adhesive agentinlet 23 g is formed when shield cover 2 is placed (see FIG. 2).

At the time of assembling OIS fixing part 20, first, coil substrate 21and sensor substrate 22 are bonded by soldering. In this manner, thepower-source line (not illustrated) of sensor substrate 22 and OIS coilpart 211 are electrically connected to each other. Depending on theattaching tolerance at this time, the protruding lengths of groundterminals 221 and 222 in ground terminal housing parts 231 and 232 ofbase member 23 change.

Next, positioning holes 21 c of coil substrate 21 and positioning holes22 b of sensor substrate 22 are fitted to positioning bosses 23 b ofbase member 23, to dispose coil substrate 21 and sensor substrate 22 onbase member 23. When ground terminal parts 221 and 222 of sensorsubstrate 22 are engaged with ground terminal housing parts 231 and 232of base member 23, and control terminal parts 223 and 224 are engagedwith control terminal housing parts 233 and 234, coil substrate 21 andsensor substrate 22 are fixed to base member 23. In this manner, OISfixing part 20 is assembled.

Here, ground terminal parts 221 and 222 are separated from the edges ofground terminal housing parts 231 and 232, that is, side surface 23 d ofbase member 23. FIG. 8 illustrates an attaching state of ground terminalpart 221 to base member 23. As illustrated in FIG. 8, protruding lengthL1 of first ground terminal 221A to base member 23 and protruding lengthL2 of second ground terminal 221B to base member 23 are different fromeach other.

When the attachment position of sensor substrate 22 is shifted as awhole to the base end side in the Y direction (ground terminal housingpart 232 side of base member 23) with an attaching tolerance, protrudinglength L1 of first ground terminal 221A to first ground terminal housingpart 231A (see FIG. 8) and protruding length L2 of second groundterminal 221B to second ground terminal housing part 231B (see FIG. 8)decrease. In this case, the contact area between second ground terminal221B and shield cover 2 decreases. Consequently, the conduction statebetween second ground terminal 221B and shield cover 2 is easilyimpaired. On the other hand, the contact area between first groundterminal 221A and shield cover 2 is sufficiently ensured although thecontact area decreases. Accordingly, a favorable conduction statebetween first ground terminal 221A and shield cover 2 is ensured.

In addition, when the attachment position of sensor substrate 22 isshifted as a whole to the front end side in the Y direction (groundterminal housing part 231 side of base member 23) with an attachingtolerance, protruding length L1 of first ground terminal 221A to firstground terminal housing part 231A and protruding length L2 of secondground terminal 221B to second ground terminal housing part 231Bincrease. In this case, the end of first ground terminal 221A is closeto the edge of first ground terminal housing part 231A (that is, sidesurface 23 d), and the adhesive agent may possibly enter the portionbetween first ground terminal 221A and shield cover 2, thus causingpartial insulation. Consequently, the conduction state between firstground terminal 221A and shield cover 2 is easily impaired. On the otherhand, the end of second ground terminal 221B is sufficiently separatedfrom the edge of second ground terminal housing part 231B even whenprotruding length L2 increases. Accordingly, the possibility of entranceof the adhesive agent to the portion between second ground terminal 231Band shield cover 2 is low, and a favorable conduction state betweensecond ground terminal 221B and shield cover 2 is ensured.

As described above, even when the protruding length of the groundterminal is changed with an attaching tolerance and the conduction statebetween one of the ground terminals (for example, first ground terminal221A) and shield cover 2 can be easily impaired, the conduction statebetween the other ground terminal (for example, second ground terminal221B) and shield cover 2 is ensured. Accordingly, lens driving device 1has high reliability and is resistant to drop impact and the like.

The same applies to the conduction state between third ground terminal222A and shield cover 2, and the conduction state between fourth groundterminal 222B and shield cover 2. In this manner, with a plurality ofground terminals having different lengths (first ground terminal 221Aand second ground terminal 221B, and third ground terminal 222A andfourth ground terminal 222B) disposed at the opposite two sides of theperipheral portion, the reliability of lens driving device 1 can befurther increased.

At the time of assembling lens driving device 1, one end (upper end) ofsuspension wire 30 is inserted to wire connecting part 131 e of upperleaf springs 13A and 13B and is fixed by soldering. In this manner,suspension wire 30 and upper leaf springs 13A and 13B are electricallyconnected to each other.

In addition, the other end (lower end) of suspension wire 30 is insertedto wire fixing hole 21 b of coil substrate 21 and is fixed by soldering.In this manner, suspension wire 30 and the power-source line of sensorsubstrate 22 are electrically connected to each other. Throughsuspension wire 30 and upper leaf springs 13A and 13B, power can be fedto AF coil part 112.

In addition, a damper (not illustrated) is disposed at damperinstallation part 121 d (including upper portion of wire insertion part121 a) of magnet holder 121 in such a manner as to surround suspensionwire 30. Thus the damper is interposed between magnet holder 121 andupper leaf springs 13A and 13B. By interposing the damper (notillustrated) between magnet holder 121 and upper leaf springs 13A and13B, generation of unnecessary resonance (high-order resonance mode) canbe reduced, and consequently, the stability of the operation can beensured. The damper can be readily applied to damper installation part121 i by use of a dispenser. For example, ultraviolet curing siliconegel can be adopted as the damper.

Shield cover 2 is attached to lens driving device 1 such that a lowerinner peripheral surface of shield cover 2 makes contact with groundterminals 221 and 222 of sensor substrate 22. To be more specific,shield cover 2 is placed to cover placing part 23 f of base member 23,and adhesive agent is supplied from adhesive agent inlet 23 g. Bycapillarity, the supplied adhesive agent fills the portion betweenshield cover 2 and side surface 23 d of base member 23, thus bondingshield cover 2 and side surface 23 d of base member 23. At this time,the advancement of the adhesive agent is blocked by the step of groundterminal housing parts 231 and 232 and side surface 23 d, and thereforethe adhesive agent does not flow into ground terminal housing parts 231and 232. By adjusting the supply amount of the adhesive agent, inflow ofthe adhesive agent to ground terminal housing parts 231 and 232 can bereadily prevented.

In lens driving device 1, when OIS coil part 211 is energized, a Lorentzforce is generated at OIS coil part 211 by interaction between themagnetic field of magnet part 122 and the current flowing through OIScoil part 211 (Fleming's left hand rule). The direction of the Lorentzforce is the direction (the Y direction or the X direction) orthogonalto the direction of the magnetic field (the Z direction) and to thedirection of the current flowing through the long side portion of OIScoil part 211 (the X direction or the Y direction). Since OIS coil part211 is fixed, a reactive force acts on magnet part 122. With thisreactive force serving as the driving force of the OIS voice coil motor,OIS movable part 10 including magnet part 122 sways in the XY plane, andthus shake correction is performed.

In addition, in lens driving device 1, when AF coil part 112 isenergized, a Lorentz force is generated at AF coil part 112 byinteraction between the magnetic field of magnet part 122 and thecurrent flowing through AF coil part 112. The direction of the Lorentzforce is the direction (the Z direction) orthogonal to the direction ofthe magnetic field (X direction or Y direction) and the direction of thecurrent flowing through the AF coil part 211 (the Y direction or the Xdirection). Since magnet part 122 is fixed, a reactive force acts on AFcoil part 112. With this reactive force serving as the driving force ofthe AF voice coil motor, AF movable part 11 including AF coil part 112moves in the light axis direction, and thus focusing is performed.

Here, in an non-energization state where focusing is not performed, AFmovable part 11 is suspended between the infinity position and the macroposition with upper leaf springs 13A and 13B and lower leaf spring 14(hereinafter referred to as “reference state”). That is, in OIS movablepart 10, AF movable part 11 (lens holder 111) is elastically supportedsuch that AF movable part 11 is displaceable in the Z direction in thestate where the position of AF movable part 11 with respect to AF fixingpart 12 (magnet holder 121) is set by upper leaf springs 13A and 13B,and lower leaf spring 14.

At the time of focusing, the direction of the current is controlledbased on whether AF movable part 11 is moved from the reference state tothe macro position side or to the infinity position side. In addition,the value of the current is controlled based on the movement length ofAF movable part 11.

As described above, lens driving device 1 includes: an OIS driving part(driving part) including a OIS movable part 10 (movable part) where alens part (not illustrated) is disposed and OIS fixing part 20 (fixingpart) where OIS movable part 10 is fixed; base member 23 having arectangular shape in plan view, wherein shield cover 2 is attached at aperipheral portion of base member 23, and a side surface of theperipheral portion and a lower inner peripheral surface of shield cover2 are bonded to each other with an adhesive agent; and ground terminalpart 221 (first ground terminal part) disposed in base member 23 andconfigured to be electrically connected with shield cover 2. Base member23 includes at a first side of the peripheral portion first groundterminal housing part 231A and second ground terminal housing part 231Brecessed from the side surface. Ground terminal part 221 is integrallyattached to the first side. Ground terminal part 221 includes firstground terminal 221A and second ground terminal having differentlengths, first ground terminal 221A and second ground terminal beingrespectively disposed in first ground terminal housing part 231A andsecond ground terminal housing part 231B so as to be separated from theside surface.

In lens driving device 1, ground terminal part 221 integrally attachedat the first side of the peripheral portion of base member 23 includesfirst ground terminal 221A and second ground terminal 221B havingdifferent lengths, and therefore, even when the attachment position ofone of the ground terminals (for example, first ground terminal 221A) ischanged to a position where the conduction state with shield cover 2 iseasily impaired with an attaching tolerance, the attachment position ofthe other of the ground terminals (for example, second ground terminal221B) is held at a position where the conduction state with shield cover2 can be ensured. Accordingly, even in the case where the attachmentposition of the ground terminal is shifted with an attaching tolerance,the conduction state between shield cover 2 and ground terminal part 221is ensured, and the reliability of lens driving device 1 is remarkablyimproved.

While the invention made by the present inventor has been specificallydescribed based on the preferred embodiments, it is not intended tolimit the present invention to the above-mentioned preferred embodimentsbut the present invention may be further modified within the scope andspirit of the invention defined by the appended claims.

For example, while the lens driving device has an AF function and an OISfunction in the embodiment, the present invention is applicable to alens driving device having an AF function or a lens driving devicehaving an OIS function, that is, a lens driving device including adriving part (an AF driving part or an OIS driving part) that drives alens part in which a shield cover is attached to a base member where theground terminal is disposed.

In addition, for example, while a plurality of ground terminals havingdifferent lengths are disposed at the two sides opposite to each otherin the Y direction at the peripheral portion of base member 23 in theembodiment, it suffices that a plurality of ground terminals havingdifferent lengths are integrally disposed at at least one side of theperipheral portion. In addition, while ground terminal parts 221 and 222are integrally attached to base member 23 in the embodiment, groundterminal parts 221 and 222 may also be independently attached to basemember 23.

While a smartphone serving as a camera-equipped mobile terminal isdescribed in the embodiment as an example of a camera mounting devicehaving camera module A, the present invention is applicable to a cameramounting device serving as an information apparatus or a transportapparatus. The camera mounting device serving as an informationapparatus is an information apparatus including a camera module and acontrol section that processes image information obtained with thecamera module, such as a camera-equipped mobile phone, a note-typepersonal computer, a tablet terminal, a mobile game machine, awebcamera, and a camera-equipped in-vehicle apparatus (for example, arear-view monitor apparatus or a drive recorder apparatus). In addition,the camera mounting device serving as a transport apparatus is atransport apparatus including a camera module and a control section thatprocesses an image obtained with the camera module, such as anautomobile.

FIGS. 9A and 9B illustrate automobile C serving as a camera mountingdevice in which an in-vehicle camera module vehicle camera (VC) ismounted. FIG. 9A is a front view of automobile C, and FIG. 9B is a rearperspective view of automobile C. In automobile C, camera module Adescribed in the embodiment is mounted as in-vehicle camera module VC.As illustrated in FIG. 9, in-vehicle camera module VC is attached to thewindshield so as to face the front side, or attached to the rear gate soas to face the rear side, for example. This in-vehicle camera module VCis used for a rear-view monitor, a drive recorder, collision-avoidancecontrol, automatic operation control, and the like.

The embodiment disclosed herein is merely an exemplification and shouldnot be considered as limitative. The scope of the present invention isspecified by the following claims, not by the above-mentioneddescription. It should be understood that various modifications,combinations, sub-combinations and alterations may occur depending ondesign requirements and other factors in so far as they are within thescope of the appended claims or the equivalents thereof.

This application is entitled to and claims the benefit of JapanesePatent Application No. 2014-265990 dated Dec. 26, 2014, the disclosureof which including the specification, drawings and abstract isincorporated herein by reference in its entirety.

REFERENCE SIGNS LIST

-   1 Lens driving device-   2 Shield cover-   10 OIS movable part (AF driving part)-   11 AF movable part-   111 Lens holder-   112 AF coil part-   12 AF fixing part-   121 Magnet holder-   122 Magnet part (AF magnet part, OIS magnet part)-   13 Upper elastic supporting part-   13A, 13B Upper leaf spring (Upper elastic supporting member)-   14 Lower elastic supporting part, Lower leaf spring (Lower elastic    supporting member)-   20 OIS fixing part-   21 Coil substrate-   211 OIS coil part-   211A to 211D OIS coil-   22 Sensor substrate-   221, 222 Ground terminal part-   221A, 221B, 222A, 222B Ground terminal-   23 Base member-   231, 232 Ground terminal housing part (terminal housing part)-   24 Position detection part-   24A, 24B Hall device-   30 Supporting member-   M Smartphone-   A Camera module

1. A lens driving device comprising: a driving part including a movablepart where a lens part is disposed and a fixing part where the movablepart is fixed; a base member having a rectangular shape in plan view,wherein a shield cover is attached at a peripheral portion of the basemember, and a side surface of the peripheral portion and a lower innerperipheral surface of the shield cover are bonded to each other with anadhesive agent; and a ground terminal part disposed in the base memberand configured to be electrically connected with the shield cover,wherein: the base member includes at a first side of the peripheralportion a plurality of terminal housing parts recessed from the sidesurface, the ground terminal part includes a first ground terminal partintegrally attached to the first side, and the first ground terminalpart includes a plurality of ground terminals having different lengths,the ground terminals being respectively disposed in the plurality ofterminal housing parts to be separated from the side surface.
 2. Thelens driving device according to claim 1, wherein: the base memberincludes at a second side opposite to the first side a plurality ofterminal housing parts recessed from the side surface; the groundterminal part includes a second ground terminal part integrally attachedto the second side; and the second ground terminal part includes aplurality of ground terminals having different lengths which arerespectively disposed in the terminal housing parts formed at the secondside to be separated from the side surface.
 3. The lens driving deviceaccording to claim 2, wherein the first ground terminal part and thesecond ground terminal part are integrally attached to the base member.4. The lens driving device according to claim 1, wherein the drivingpart includes an auto-focusing driving part including an auto-focusingcoil part disposed at a periphery of the lens part, and an auto-focusingmagnet part disposed separately from the auto-focusing coil part in aradial direction, the auto-focusing driving part being configured toperform automatic focusing by moving, with respect to the fixing partincluding one of the auto-focusing coil part and the auto-focusingmagnet part, the movable part including the other of the auto-focusingcoil part and the auto-focusing magnet part in a light axis direction byuse of a driving force of a voice coil motor composed of theauto-focusing coil part and the auto-focusing magnet part.
 5. The lensdriving device according to claim 1, wherein the driving part includes ashake-correcting driving part including a shake-correcting magnet partdisposed in the movable part and a shake-correcting coil part disposedin the fixing part, the shake-correcting driving part being configuredto perform shake correction by swaying the movable part with respect tothe fixing part in a plane orthogonal to a light axis direction by useof a driving force of a voice coil motor composed of theshake-correcting coil part and the shake-correcting magnet part.
 6. Acamera module comprising: the lens driving device according to claim 1;a lens part mounted to the movable part; an image capturing partconfigured to capture a subject image imaged with the lens part; and ashield cover attached to the base member.
 7. A camera mounting devicethat is an information apparatus or a transport apparatus, the cameramounting device comprising the camera module according to claim 6.